. First lessons in zoology. Zoology. 2 04 FIRST LESSONS IN ZOOLOGY then the spiral ones (fig. 164). Two sets of spiral lines are put in, a first set, which is made fi-om the center out- wards, is not sticky, and serves as scaffolding upon which the spider works when putting in the second set. The latter is sticky and is put in from the outer part of the web toward the center. The tem- porary spiral or scaffolding is torn out as the work of put- ting in the sticky permanent spiral progresses. The web building includes a great deal of interesting behavior on the part of the spider, the delicate
. First lessons in zoology. Zoology. 2 04 FIRST LESSONS IN ZOOLOGY then the spiral ones (fig. 164). Two sets of spiral lines are put in, a first set, which is made fi-om the center out- wards, is not sticky, and serves as scaffolding upon which the spider works when putting in the second set. The latter is sticky and is put in from the outer part of the web toward the center. The tem- porary spiral or scaffolding is torn out as the work of put- ting in the sticky permanent spiral progresses. The web building includes a great deal of interesting behavior on the part of the spider, the delicate manipulation of the viscid lines, and the almost geomet- rically accurate disposition of the lines composing the snare, combining to render the whole performance little short of marvellous. There are other kinds of webs spun by other kinds of spiders. Indeed among the orb-\\'eavers alone there is a great variety in the character of the webs; some, for ex- ample, lack a sector of the circle, being otherwise con-. t'lG. 165 —A lon^'-lc!;(4i'(l s|iidri Tetragnatha sp . (in its \v(_*l (Une-halfiiatunilsizc; frum lilc. structed on regular orb-web plan ; others are composed of perhaps less than one-half a circle, although still with radii, and with concentric arcs of circles in place of com- plete circles in the spiral zone. Certain kinds of spiders spin a peculiar broad line, or rather band, of curling silk, which leads from tlie snare to the side retreat. Or thc\- make of this band of curled silk a central zone not com-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
